The image on the XD material had more pop and was more vibrant vs the E4k IMO. The 4k material did not seem to retain as much light as the XD. As for the physical material, the 4K seem to delicate and easy to snag or tear. The XD was pretty strong and closer to a tradional screen material.
I would suggest ordering a 24x24 sample of each from Chris. It's enough material to give you a good idea on what results you can expect from your projector. For me, unless I'm 8ft or less, XD all the way.
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